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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2d40d71107dbc48d15210b040a4d11c0488b88a8a5c94bbbb9d15f42cb9e935' 
  AND token = '0+T1FCIK2axTrGKgcWVdk15fnobfjzNw915WSYmRpOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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