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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd51b08025b6cdc1410f9d006c5ae6355d6fa7ef055e5889cd65531e4b756a323' 
  AND token = 'os76aM10pkT+rQ4roWVxClITePUHnE4ltZZwGnhaTwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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