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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b1aa18f4e36ef60b74676960b973dc0e5fb62e0b0c0da9f97ed677e22c3ee47' 
  AND token = 'wpiV/b1lRu9mgqeiOQmnc6PJ1jvRHaMMI4vm5KuShQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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