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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '913f3f9a4e4e3a7337ebd2a69b5ce74fa353831f8710c63551749e0d3aabf957' 
  AND token = '93UrIfhi9ENdYT69qzPShuwbYJskonWEosj6Y07a7/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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