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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b453f058c142e43efcbc0482b59516e4e1c011fe6a101e5ef7a3d648b92c429' 
  AND token = '8YA9gw7W5vAkJDkp97ACYbJVliE0IYflsZN8mRiS5rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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