SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7187a18dc43539024aee836c7d71da3f1110523858e347ef928fb9000e251e53' 
  AND token = 'S5JyqBxCYv1pQo8nG+kXSOHcIVgG5vU/jC+hphIFO4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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