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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca01d42b26811d78499840df784fa9f90f9e334e6d354bac4dd891dee87d0a3d' 
  AND token = 'FsyrlYlWymQ7Js1eCgOKsG5RBnRPd0usxr8JU+vxqJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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