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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e2ff1e891f41f7f983096f9207d698c7416b71dea70ff8b41c88b9fecade6c1' 
  AND token = 'BxGHiHknDbFLhfQmMNbwsUkosFs5FstLjqj3+8ytdHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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