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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db962c92518f854a766c73e898051dc1b7b8fc5ece8bda610538945694d04363' 
  AND token = 'flxESN4+MaG1VpX4nMEM6FwDAd8ARgIT8sJ6JMAR5OE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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