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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05f1d31b403864408d7cf5f2ada74640b503c252a83a35f498f5c5695a7c584f' 
  AND token = 'WnOUKGfT2vt7+N67eWYFBSga4cfJIhLmGiVckYcfrNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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