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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4dd8ff4f7a72d7ff89769951a4bebc3bac076b96d2ba41ac103c97d6f1128ea' 
  AND token = 'MWI2ioBfYSuLB7yUGVbrPxNHxBH0+c1rA8EBROaUcos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00011

JSON explain

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