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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4dd4f58628821868f59777907286e6b64992f7a16b60a189a59169453b94d14f' 
  AND token = 'C5w3X7SA0M0EeGQfqjQR4kJ0m6qKIvml2B8lp0hn+D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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