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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a684ae76cd03dd67cc80757600c21369415d32d802164bf0deb72f4b8fb5f16' 
  AND token = 'oA9V1rXBvVwXoypY5TZtvTJdyAXX8L8AZwBUxWKJ36c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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