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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca8199c80e4604d076cfbad9f50688149e349501b31f4cef1d3a23b5323d7e93' 
  AND token = 'CrB0DZEQTMtMvkMmO6IN3X83ZLC2GWiTIb5JZFuj6v8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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