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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c13dc80be8104c01e33210be58224a2656bf00c1677b961198c7f095e78ad5' 
  AND token = 'Zj+nz7REsasgoHyxulMP2KWPYHVdjha9uSuo+F6b0uU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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