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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0dab55ce66533e943a750abb323c19fd7111ab3c25c1ceb827500d121c44b0d' 
  AND token = 'HrnC4t1aXMApeiYa/XTVOto7qlg5PpTc6pABvHv+Vhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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