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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '687db08145ed1ac065d588e9c41f95a35d18bbcab76c4342cb6345510384a111' 
  AND token = 'v1PCEgrBvrO/hTRGFSvLVfHAqPHNvvBI9W9li1elQKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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