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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028b19ba8dabc47e2e8c45c9e5c8a7333c07b45bb47a1ddc9a6c002a0650e7e1' 
  AND token = 'sPD3xGJatw4KU80ZUUDez13s8dJWljL8f7k2k4be23w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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