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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5af295387d6d923a2bc0ad3da1446ec014538a36a1b8633bf5636bb9b074bdf' 
  AND token = '39b7F4yuJaL/tyFKd/WGk1GNkWLcrGly2V9ssUdw49E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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