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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffc57bae51abc54863ea4a5f157f5aec1c337bb81b062176ef74fda1d4df2ce1' 
  AND token = '9jA1w91fbfg0I/N26LDmDBuKj6m9g5ebL5nA63b0MHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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