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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c624d4d8da4f2ab42d07118ce633b4ae00af2ec4b69f8650c4cbb7da1c64962d' 
  AND token = 'zOLax0tycFsocM60pkfjdoq+NWSz36riW9U3zvN1WwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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