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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08101f067476b64c2af9867fb915987d5b0ddcc8220cc7ff7bd258e6c5c21080' 
  AND token = 'HiYT8qZjuvrvVLX6QwMZwd0QRTbVfhU1K7dCKtehLXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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