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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '479efc5eae97e1be5cf4ed4827ff8afc0386a33115f4c07c3935a9573668fdf8' 
  AND token = 'ln4C7/2tZ36lo5AUjNykO/oSUd0sfvw8uwEOShXY8GM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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