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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03e0a406fcf0cfba84714603ab26379978e7125407ece478111a6d876939af4' 
  AND token = 'qIoL8KsX/9jab8t+Ouph/LK9FvTeAcuCLhG+Oqcac/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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