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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec76cfaa3a07b86cb754110843a4d5ed6ebb0f01f09a636f1e6478a8d81f84d7' 
  AND token = 'dAjakqGII3yGat4YPKNmVUhNr2Ya4AbQXert4dva9w4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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