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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0f3c3427f9cae6b285fd79899fce5055db1333b8e1fdaf369269ffe42c9e361' 
  AND token = '4shb9kVXboKDisrDK6Ai5WpXmxBOx6u+/dyXGG9ex+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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