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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba3d1c9664bec3e343fedc39a85ebd8bf7ef0d96a0eb81e2fc2ecdf1463edbf' 
  AND token = '/rLUYxFl+KuCwATWltta2gBIVYxotMSotmLfd2KFI4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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