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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4b68c3955709b8a92313acae911664a1ef6044048cf85ecbc1d010ff2fb0549' 
  AND token = 'QbQotcuW0KSEhS1NpBZkcZYuzJxlrTjvs7VN8/jAR9o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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