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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '620abcd83b7c0e4c6d7c144711b7961ecf0ef4db56fb60ae8ea53462ea50c418' 
  AND token = 'oqT6tZZ3jizp1jf9yjkQ/KC0voy2hKJNQhtwAvnx/dY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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