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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5abadc3d7c7edbb3f26ec8bde2eef3a0ed2cd9f4e60272420671b3b3b4a47cee' 
  AND token = 'd59NZJULSknL214Im2S3vY7tcYQSweig4aRa2sSlgGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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