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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e982de6883aba0554e66d57b532a93844327a3af8af8609665fb2187ce9b97c6' 
  AND token = 'aFJFTPbPrFrmHIMvmYzZtIJ08I+xGo+O8aHpX6x73UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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