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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d6ffcbaf898bb0a29d2e1377440039f4f34902b79233e859d4b8fef6c719988' 
  AND token = 's3oRkj++UcQg5+6MmyqQdt4qE1PzHq3PJ7KOW42FdwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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