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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a5b4fc8d797d81165ac31650480ff5704b30600edbbc30f71ff9a6a6d369297' 
  AND token = 'usPySqUQMEKU74VOl9AQ/c8NEIAk2IEeKUgf5Uhyx2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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