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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d83859f24af25b0fc3c3c9db28d9d6ed91145ad6fe39c60bd80bfdd9912d25c' 
  AND token = 'Ol7gp4lbvzjcKlFzq4tQ1dga2lyuFVtVxRyRjhDC7LY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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