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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1603bcc6e65cc1357569184c197d56fdfc1f4ce3b94c0ca11b8b7c692aa5bb91' 
  AND token = '4K9c+yylbjP73xNTR8nGRZwd/5CzdE4luL0syHmZ4fg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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