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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3fae843d90a046cb332117f6fb9711a74a909d93f998d7d730962de7b412e5' 
  AND token = 'MdQBedFksAgq2Af3+J2/kHYayntZTKTPaTDo3kaDlec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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