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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bb27a6d8e72e4e8ba480cbe359c1edace5b0024a6ecbb0dc6cf1c3d0f337df6' 
  AND token = 'QNsgBbMo8IXCuHFtWMYNFz2wKvFHfpanNPJwgTdpyxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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