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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '493a165625ceedbe959704da3e3785975d116d7fa17275e7e08c0d6912e87a3c' 
  AND token = '1n+VgfFFJ7Oi6vvoXGH/IcEscAsD/drLx8U5jBKbttA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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