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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1617c0fa45de08f0c63470ed829c95af909a8b88e32c5b56f232964a8c69ec2' 
  AND token = 'AFT2Ti22ZBoIzYA4k8gRx+bkYapgEQJ7eLfIfvYqNx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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