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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc1b5003adeb27e791e4a23c57c7363677bc9ae2069994dc61072958d555794a' 
  AND token = '4KpcHKzcmBCF6DpMQmFIEn7rbJFCIfk6xfUqqO28908=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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