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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce6868a78bac2a4f62a2e01daf6edd19e7a05418d8479b96f4a3a9097911b675' 
  AND token = 'sWauwxXMxsgrYFDzazEURKNErsdQTHfrtxPKffo42VE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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