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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbfd0be00396197abc81728e999c7b72f55ae91b7a6bd88e1a9c67f91fe5a2de' 
  AND token = 'SeZ7MQ+M2HOYb9Z9EpkSB/72l+kfA+RSh8v/oOMcRGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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