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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31c7023653cf5061a62c3fe939896546224e200c451bfc086596d3122944de5c' 
  AND token = 'QMui+QapIoNSzOHJf751gt9ILgQiJ9R5XUmq71Rrq8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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