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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62084714686c8c18ab2e79677d718d739a964e5a7e957d3a60e7d779284ea038' 
  AND token = 'v/9mrZtyrOt0qeznpkWu67jNFmV2TkErkVWOG1aJ9G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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