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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ca924a642b136a6fdf0b65c463df92f6f4f5da2fcabe43cb3066bab938e90de' 
  AND token = 'mvMrLY+4p5o540KbnzLmUUqVDb+/pVolnQwkXf/uN+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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