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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc07c97d9d144180f9da505e5f73f710aa0e486e92840d02d9a982a82e1fde0d' 
  AND token = '9Ey7ENQf6Z0RFRM92y32pvkKCzGZcRMo3/YnfSlbN/M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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