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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b450f97014fccdcb8c8458ae4fef177cf3ad3b88af9bd39dc699b76755fe56bd' 
  AND token = 'kulsgGeNq/1UzeP2KprCa/cLdBza4LsWN+bezSS4O/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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