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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91eadf1567d8fe3657bb3098b36f0d04c05a0dbba185f5b6bddf50152c182f07' 
  AND token = 'XImN/LjVDt4KNYZc8WZ6+LdTsvqQcRnnjQSP8fxmT3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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