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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28b8659be495182c35119be6474904a0c4ad872313d537d73f031d56e9dccd8a' 
  AND token = 'iiAeNgNDZjTvt3uu+5FYieTUivB+VNbBu+FdXWmgNmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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