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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b666ae1389b388087a499a23c03c5266ea1efc6681e2d9ebfa0a5b93d0d48228' 
  AND token = '06Zwq371fCIcchtZz7b3ffkkK6hLKocG6dl4NsYu8mA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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