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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '403aabc8fde6b94009d75b296bfee173b8f1a230a5ea8ebd7b993e0404808d8e' 
  AND token = 'Gx+X7Z/jDLZ9Pfkkcy8vYJozEHjiUyxz0urLpn1BKEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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