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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '694559e3ff0cf5effcab9e40ef8c93b9fe4017cc1d7469fa10c09dcc8d5e6044' 
  AND token = 'l98kskKDml0kUiw+H5YPgJRt728iWRo2APJPTRo8eks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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