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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3923954f38bd1f962be57b757ceee650a52aac4ce1efba5a2a3304f8d755543' 
  AND token = 'dkCi3XujQF6bRL29ByBJbpYfQewdo6ULO5yQLx+v62s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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