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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3513c08c60a5575234583be144b892b13535602f144099e86c3fe78df01c1cb' 
  AND token = '0+tQsgH0+L5QtsZmGRKXSPFSRVx6etlcW++ZyxDwFSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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