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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d0bc24bdda7e5283df66931cfa6608d73684d93c5857689eacbc1acc1355230' 
  AND token = 'Cu8CeMMiw/QK1wr2djGcapC+AwW1XK8JfJ3rs4oaldA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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