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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e20e43c672cd0abf0bf207851529800e9926d31f56788a3700e1ca27728b736' 
  AND token = 'kWfIK8o7sn7S8xhHEZ5xyYHJcE1aKyuIdSTNzdCp0N0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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