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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7559343b433fdce4c096d670cf74d44511d98a94022489099b07d5b49d9f2498' 
  AND token = 'ipfghgxsNcSSNWXaPtig0/eKpuXGHxNJPPpL/T9sFks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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