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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '338d95494590129dc3abe9a9abb0c0b1846579702172420e2121cd0133bd794c' 
  AND token = 'gD5jyYDHrahWj37OPOn2lK3R0yY0qchukgnnpXyD8hY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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