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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3903cbbcf520a53e09ef1c8722de8d7f6ee5476b8b0fa7757b0d04ef771993d' 
  AND token = 'lzjzux1ZfW9Z7l/NLBfX+UfD8pfVA8TX+kboESZnmSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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