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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a7e799d178016d50ab3408f96d159a462fa3561f65ff092471044c9f56b19508' 
  AND token = '99B/GCgbea4B4VdjQmEaWM2ccowOJ7OCk4jOMhi5VYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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