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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa079f576f2d37f136149aa0d27c11ad256896cbdfc6a37e94bc06ad08fbe7c7' 
  AND token = 'psdHz81ZPO69IW6u0PPYa7OT0ZqSVcIlt5vD4YgYfgU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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