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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6f0f1fbad8f6c6b6ec6a034b7a338a9fde3d3a35df68b3e0e0a8fe41406b3a' 
  AND token = 'Ucr9Yg65bCfAO+u12v0nhpMvf56/EyqrA1c65nrK8Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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