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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2bd94eb5712f39ee85c0d87da3aa968c53de1bd724c6e38d35a5c662bfc8131' 
  AND token = 'NPfDceK9ZtUgdLwT5X/Z1LZSwUl+o4g2Hij48+S2wLI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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