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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8de4a65c13e732661d3a7b81178e2086a01e4dce6198cb977ed47f84ba1f73ee' 
  AND token = '/QKKDdsfX8dRIVevWA9x4MPBcsqPqKls1W8v8ihTXMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00104

JSON explain

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