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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7e42ee021d0ca935a347d0e9198a2ba7530d10e4a87e418d2e991b53cc31e55' 
  AND token = 'ZK4mERLCcsiE16/jUPBvVb+wWSOfC3CP+lX7GScpIWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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