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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d5cf834dce38d0e915b74751923c6deb23ea0d868184f0e8ec58f38abd8e2d' 
  AND token = 'tdj27yDNtLaaKwEz/xvSJJofQpoUvHy6sp9qASA4GJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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