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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7fa450c451744411d3f73e01e0fa9f8712d3a377e4c9f7c8779730e68dea4b5' 
  AND token = 'JbkbP4FT/ca8Hrz2oKlbNfkBhGehlI85eZE9vcG+75M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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