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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055dc83be88c61b386143e0250851d85b9349ab0200460a50b494dd2e50227f5' 
  AND token = 'Y8Qi3HZDhDJFmZHhfNwHwpf9KpDsi3HvdnWwULpuaHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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