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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95053408c90fff4130575f8522d39829f05239dee3569d33442bfc8796e3bce7' 
  AND token = 'a/CAmkYN0PpOrM1kBASZkf4/Naf+GnHb20/jJfsCgyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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