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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1254947547fa9e9598ec37f17e1071bcfe923cd673ba9199f447d56e6a3094d3' 
  AND token = 'OqxXmFgoQIYJbY4HM4N0NqYcwhG0TgpuzpOluR63CCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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