SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '16906d4c7a5dbe00c4efa596d40ec4f347b35167fac1d5a9970157d6396b62fc' 
  AND token = '4UC2Pw1trWKZ1jPAFHkzgNxHxXxLnGmG/Br20qmZssU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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