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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1881fc447d36a644a48ca5107f047691640c008d20274cd6ee81b5091bb3e902' 
  AND token = 'MxjTlvkTbHMO6teIqWqKL/mxkGtdmP2HXB99zInE11c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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