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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07fb8298be2d9b05b0e29159773de1460c24256b3f02ee4f0674761a93f6f35c' 
  AND token = 'B86Lwi9cD/p7d+m1sI8G1G+JStW6zulDVkrwiiWNITE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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