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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f1f66c747836c22f65f7aede13d7355f2227b52e08bb29875285e1297c606ac' 
  AND token = 'edEUi596B9pMmWq9oBUIr4fjFSfVNAYEhBzSIrzJ4w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}