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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60fc167828514161e5465c130460bdc71b36d06af2ec0ea5d30c57b509006dd1' 
  AND token = 'G/bMxs/uuoOmE/52evOSDEdqlkQoyCYgmQ/oYow2IYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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