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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d7088aa4ab99a55586e2813d7702ad216e473463699f5ff3fbd0cb7c6ae116' 
  AND token = 'w30F2ID1YHe35vFcW271FpD7qIehc+0ljExXDYH/ans=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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